Frequencies for first 10,000 rows of not_hour variable in accident dataset :

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        384        3.84        3.84
          1 |        205        2.05        5.89
          2 |        156        1.56        7.45
          3 |        122        1.22        8.67
          4 |        111        1.11        9.78
          5 |        139        1.39       11.17
          6 |        216        2.16       13.33
          7 |        163        1.63       14.96
          8 |        137        1.37       16.33
          9 |        178        1.78       18.11
         10 |        159        1.59       19.70
         11 |        192        1.92       21.62
         12 |        197        1.97       23.59
         13 |        236        2.36       25.95
         14 |        244        2.44       28.39
         15 |        266        2.66       31.05
         16 |        289        2.89       33.94
         17 |        301        3.01       36.95
         18 |        301        3.01       39.96
         19 |        278        2.78       42.74
         20 |        287        2.87       45.61
         21 |        249        2.49       48.10
         22 |        251        2.51       50.61
         23 |        229        2.29       52.90
         24 |          2        0.02       52.92
         99 |      4,708       47.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016